Physical uplink control channel (PUCCH) sequence configuration

ABSTRACT

Certain aspects of the present disclosure relate to methods and apparatus relating to a physical uplink control channel (PUCCH) sequence design. In some cases, a UE receives (from a network entity, such as a base station/gNB) signaling indicating a base sequence from a set of base sequences available for use in sending one or more bits of uplink control information (UCI) within a transmission time interval (TTI), receives signaling indicating a set of feasible cyclic shifts, selects one of the cyclic shifts based on a value of the one or more bits of UCI, and transmits the UCI using the base sequence and the selected cyclic shift.

CLAIM OF PRIORITY UNDER 35 U.S.C. § 119

This application claims the benefit of U.S. Provisional PatentApplication Ser. No. 62/527,029, filed Jun. 29, 2017, which is hereinincorporated by reference in its entirety.

FIELD

The present disclosure relates generally to communication systems, andmore particularly, to methods and apparatus relating to physical uplinkcontrol channel (PUCCH) sequence configuration.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power). Examples of such multiple-access technologies includeLong Term Evolution (LTE) systems, code division multiple access (CDMA)systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems.

In some examples, a wireless multiple-access communication system mayinclude a number of base stations, each simultaneously supportingcommunication for multiple communication devices, otherwise known asuser equipment (UEs). In LTE or LTE-A network, a set of one or more basestations may define an eNodeB (eNB). In other examples (e.g., in a nextgeneration or 5G network), a wireless multiple access communicationsystem may include a number of distributed units (DUs) (e.g., edge units(EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs),transmission reception points (TRPs), etc.) in communication with anumber of central units (CUs) (e.g., central nodes (CNs), access nodecontrollers (ANCs), etc.), where a set of one or more distributed units,in communication with a central unit, may define an access node (e.g., anew radio base station (NR BS), a new radio node-B (NR NB), a networknode, 5G NB, eNB, etc.). A base station or DU may communicate with a setof UEs on downlink channels (e.g., for transmissions from a base stationor to a UE) and uplink channels (e.g., for transmissions from a UE to abase station or distributed unit).

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. An example of an emergingtelecommunication standard is new radio (NR), for example, 5G radioaccess. NR is a set of enhancements to the LTE mobile standardpromulgated by Third Generation Partnership Project (3GPP). It isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingOFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink(UL) as well as support beamforming, multiple-input multiple-output(MIMO) antenna technology, and carrier aggregation.

However, as the demand for mobile broadband access continues toincrease, there exists a desire for further improvements in NRtechnology. Preferably, these improvements should be applicable to othermulti-access technologies and the telecommunication standards thatemploy these technologies.

BRIEF SUMMARY

The systems, methods, and devices of the disclosure each have severalaspects, no single one of which is solely responsible for its desirableattributes. Without limiting the scope of this disclosure as expressedby the claims which follow, some features will now be discussed briefly.After considering this discussion, and particularly after reading thesection entitled “Detailed Description” one will understand how thefeatures of this disclosure provide advantages that include improvedcommunications between access points and stations in a wireless network.

Certain aspects provide a method for wireless communications by a userequipment (UE). The method generally includes receiving signalingindicating a base sequence from a set of base sequences available foruse in sending one or more bits of uplink control information (UCI)within a transmission time interval (TTI), receiving signalingindicating a set of feasible cyclic shifts, selects one of the cyclicshifts based on a value of the one or more bits of UCI, and transmitsthe UCI using the base sequence and the selected cyclic shift.

Certain aspects provide a method for wireless communications by anetwork entity. The method generally includes providing, to at least oneuser equipment (UE) signaling indicating a base sequence from a set ofbase sequences available for use in sending one or more bits of uplinkcontrol information (UCI) within a transmission time interval (TTI),providing signaling indicating a set of feasible cyclic shifts to atleast one UE, and detecting UCI transmitted from the UE using the basesequence and one of the cyclic shifts.

Aspects generally include methods, apparatus, systems, computer readablemediums, and processing systems, as substantially described herein withreference to and as illustrated by the accompanying drawings.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the manner in which the above-recited features of the presentdisclosure can be understood in detail, a more particular description,briefly summarized above, may be had by reference to aspects, some ofwhich are illustrated in the appended drawings. It is to be noted,however, that the appended drawings illustrate only certain typicalaspects of this disclosure and are therefore not to be consideredlimiting of its scope, for the description may admit to other equallyeffective aspects.

FIG. 1 is a block diagram conceptually illustrating an exampletelecommunications system, in accordance with certain aspects of thepresent disclosure.

FIG. 2 is a block diagram illustrating an example logical architectureof a distributed RAN, in accordance with certain aspects of the presentdisclosure.

FIG. 3 is a diagram illustrating an example physical architecture of adistributed RAN, in accordance with certain aspects of the presentdisclosure.

FIG. 4 is a block diagram conceptually illustrating a design of anexample BS and user equipment (UE), in accordance with certain aspectsof the present disclosure.

FIG. 5 is a diagram showing examples for implementing a communicationprotocol stack, in accordance with certain aspects of the presentdisclosure.

FIG. 6 illustrates an example of a DL-centric subframe, in accordancewith certain aspects of the present disclosure.

FIG. 7 illustrates an example of an UL-centric subframe, in accordancewith certain aspects of the present disclosure.

FIGS. 8a and 8b illustrate example uplink and downlink structures,respectively, in accordance with certain aspects of the presentdisclosure.

FIG. 9 illustrates example 1-bit and 2-bit ACK base sequence and cyclicshifts, in accordance with certain aspects of the present disclosure.

FIG. 10 illustrates an example sequence-based transmission, inaccordance with certain aspects of the present disclosure.

FIG. 11 illustrates example operations for wireless communications by auser equipment (UE), in accordance with certain aspects of the presentdisclosure.

FIG. 12 illustrates example operations for wireless communications by anetwork entity, in accordance with certain aspects of the presentdisclosure.

To facilitate understanding, identical reference numerals have beenused, where possible, to designate identical elements that are common tothe figures. It is contemplated that elements disclosed in one aspectmay be beneficially utilized on other aspects without specificrecitation.

DETAILED DESCRIPTION

Aspects of the present disclosure provide apparatus, methods, processingsystems, and computer readable mediums for new radio (NR) (new radioaccess technology or 5G technology).

NR may support various wireless communication services, such as Enhancedmobile broadband (eMBB) targeting wide bandwidth (e.g. 80 MHz beyond),millimeter wave (mmW) targeting high carrier frequency (e.g. 60 GHz),massive MTC (mMTC) targeting non-backward compatible MTC techniques,and/or mission critical targeting ultra-reliable low latencycommunications (URLLC). These services may include latency andreliability requirements. These services may also have differenttransmission time intervals (TTI) to meet respective quality of service(QoS) requirements. In addition, these services may co-exist in the samesubframe.

The following description provides examples, and is not limiting of thescope, applicability, or examples set forth in the claims. Changes maybe made in the function and arrangement of elements discussed withoutdeparting from the scope of the disclosure. Various examples may omit,substitute, or add various procedures or components as appropriate. Forinstance, the methods described may be performed in an order differentfrom that described, and various steps may be added, omitted, orcombined. Also, features described with respect to some examples may becombined in some other examples. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition toor other than the various aspects of the disclosure set forth herein. Itshould be understood that any aspect of the disclosure disclosed hereinmay be embodied by one or more elements of a claim. The word “exemplary”is used herein to mean “serving as an example, instance, orillustration.” Any aspect described herein as “exemplary” is notnecessarily to be construed as preferred or advantageous over otheraspects.

The techniques described herein may be used for various wirelesscommunication networks such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA andother networks. The terms “network” and “system” are often usedinterchangeably. A CDMA network may implement a radio technology such asUniversal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includesWideband CDMA (WCDMA) and other variants of CDMA. cdma2000 coversIS-2000, IS-95 and IS-856 standards. A TDMA network may implement aradio technology such as Global System for Mobile Communications (GSM).An OFDMA network may implement a radio technology such as NR (e.g. 5GRA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA andE-UTRA are part of Universal Mobile Telecommunication System (UMTS). NRis an emerging wireless communications technology under development inconjunction with the 5G Technology Forum (5GTF). 3GPP Long TermEvolution (LTE) and LTE-Advanced (LTE-A) are releases of UMTS that useE-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described indocuments from an organization named “3rd Generation PartnershipProject” (3GPP). cdma2000 and UMB are described in documents from anorganization named “3rd Generation Partnership Project 2” (3GPP2). Thetechniques described herein may be used for the wireless networks andradio technologies mentioned above as well as other wireless networksand radio technologies. For clarity, while aspects may be describedherein using terminology commonly associated with 3G and/or 4G wirelesstechnologies, aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

Example Wireless Communications System

FIG. 1 illustrates an example wireless network 100, such as a new radio(NR) or 5 G network, in which aspects of the present disclosure may beperformed.

As illustrated in FIG. 1, the wireless network 100 may include a numberof BSs 110 and other network entities. A BS may be a station thatcommunicates with UEs. Each BS 110 may provide communication coveragefor a particular geographic area. In 3GPP, the term “cell” can refer toa coverage area of a Node B and/or a Node B subsystem serving thiscoverage area, depending on the context in which the term is used. In NRsystems, the term “cell” and eNB, Node B, 5G NB, gNB, AP, NR BS, NR BS,or TRP may be interchangeable. In some examples, a cell may notnecessarily be stationary, and the geographic area of the cell may moveaccording to the location of a mobile base station. In some examples,the base stations may be interconnected to one another and/or to one ormore other base stations or network nodes (not shown) in the wirelessnetwork 100 through various types of backhaul interfaces such as adirect physical connection, a virtual network, or the like using anysuitable transport network.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies. ARAT may also be referred to as a radio technology, an air interface,etc. A frequency may also be referred to as a carrier, a frequencychannel, etc. Each frequency may support a single RAT in a givengeographic area in order to avoid interference between wireless networksof different RATs. In some cases, NR or 5G RAT networks may be deployed.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or other types of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a Closed Subscriber Group (CSG), UEs for users in the home,etc.). A BS for a macro cell may be referred to as a macro BS. A BS fora pico cell may be referred to as a pico BS. A BS for a femto cell maybe referred to as a femto BS or a home BS. In the example shown in FIG.1, the BSs 110 a, 110 b and 110 c may be macro BSs for the macro cells102 a, 102 b and 102 c, respectively. The BS 110 x may be a pico BS fora pico cell 102 x. The BSs 110 y and 110 z may be femto BS for the femtocells 102 y and 102 z, respectively. A BS may support one or multiple(e.g., three) cells.

The wireless network 100 may also include relay stations. A relaystation is a station that receives a transmission of data and/or otherinformation from an upstream station (e.g., a BS or a UE) and sends atransmission of the data and/or other information to a downstreamstation (e.g., a UE or a BS). A relay station may also be a UE thatrelays transmissions for other UEs. In the example shown in FIG. 1, arelay station 110 r may communicate with the BS 110 a and a UE 120 r inorder to facilitate communication between the BS 110 a and the UE 120 r.A relay station may also be referred to as a relay BS, a relay, etc.

The wireless network 100 may be a heterogeneous network that includesBSs of different types, e.g., macro BS, pico BS, femto BS, relays, etc.These different types of BSs may have different transmit power levels,different coverage areas, and different impact on interference in thewireless network 100. For example, macro BS may have a high transmitpower level (e.g., 20 Watts) whereas pico BS, femto BS, and relays mayhave a lower transmit power level (e.g., 1 Watt).

The wireless network 100 may support synchronous or asynchronousoperation. For synchronous operation, the BSs may have similar frametiming, and transmissions from different BSs may be approximatelyaligned in time. For asynchronous operation, the BSs may have differentframe timing, and transmissions from different BSs may not be aligned intime. The techniques described herein may be used for both synchronousand asynchronous operation.

A network controller 130 may be coupled to a set of BSs and providecoordination and control for these BSs. The network controller 130 maycommunicate with the BSs 110 via a backhaul. The BSs 110 may alsocommunicate with one another, e.g., directly or indirectly via wirelessor wireline backhaul.

The UEs 120 (e.g., 120 x, 120 y, etc.) may be dispersed throughout thewireless network 100, and each UE may be stationary or mobile. A UE mayalso be referred to as a mobile station, a terminal, an access terminal,a subscriber unit, a station, a Customer Premises Equipment (CPE), acellular phone, a smart phone, a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet, a camera, a gaming device, a netbook, a smartbook, anultrabook, a medical device or medical equipment, a biometricsensor/device, a wearable device such as a smart watch, smart clothing,smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, asmart bracelet, etc.), an entertainment device (e.g., a music device, avideo device, a satellite radio, etc.), a vehicular component or sensor,a smart meter/sensor, industrial manufacturing equipment, a globalpositioning system device, or any other suitable device that isconfigured to communicate via a wireless or wired medium. Some UEs maybe considered evolved or machine-type communication (MTC) devices orevolved MTC (eMTC) devices. MTC and eMTC UEs include, for example,robots, drones, remote devices, sensors, meters, monitors, locationtags, etc., that may communicate with a BS, another device (e.g., remotedevice), or some other entity. A wireless node may provide, for example,connectivity for or to a network (e.g., a wide area network such asInternet or a cellular network) via a wired or wireless communicationlink. Some UEs may be considered Internet-of-Things (IoT) devices. InFIG. 1, a solid line with double arrows indicates desired transmissionsbetween a UE and a serving BS, which is a BS designated to serve the UEon the downlink and/or uplink. A dashed line with double arrowsindicates interfering transmissions between a UE and a BS.

Certain wireless networks (e.g., LTE) utilize orthogonal frequencydivision multiplexing (OFDM) on the downlink and single-carrierfrequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDMpartition the system bandwidth into multiple (K) orthogonal subcarriers,which are also commonly referred to as tones, bins, etc. Each subcarriermay be modulated with data. In general, modulation symbols are sent inthe frequency domain with OFDM and in the time domain with SC-FDM. Thespacing between adjacent subcarriers may be fixed, and the total numberof subcarriers (K) may be dependent on the system bandwidth. Forexample, the spacing of the subcarriers may be 15 kHz and the minimumresource allocation (called a ‘resource block’) may be 12 subcarriers(or 180 kHz). Consequently, the nominal FFT size may be equal to 128,256, 512, 1024 or 2048 for system bandwidth of 1.25, 2.5, 5, 10 or 20megahertz (MHz), respectively. The system bandwidth may also bepartitioned into subbands. For example, a subband may cover 1.08 MHz(i.e., 6 resource blocks), and there may be 1, 2, 4, 8 or 16 subbandsfor system bandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.

While aspects of the examples described herein may be associated withLTE technologies, aspects of the present disclosure may be applicablewith other wireless communications systems, such as NR. NR may utilizeOFDM with a CP on the uplink and downlink and include support forhalf-duplex operation using time division duplex (TDD). A singlecomponent carrier bandwidth of 100 MHz may be supported. NR resourceblocks may span 12 sub-carriers with a sub-carrier bandwidth of 75 kHzover a 0.1 ms duration. Each radio frame may consist of 50 subframeswith a length of 10 ms. Consequently, each subframe may have a length of0.2 ms. Each subframe may indicate a link direction (i.e., DL or UL) fordata transmission and the link direction for each subframe may bedynamically switched. Each subframe may include DL/UL data as well asDL/UL control data. UL and DL subframes for NR may be as described inmore detail below with respect to FIGS. 6 and 7. Beamforming may besupported and beam direction may be dynamically configured. MIMOtransmissions with precoding may also be supported. MIMO configurationsin the DL may support up to 8 transmit antennas with multi-layer DLtransmissions up to 8 streams and up to 2 streams per UE. Multi-layertransmissions with up to 2 streams per UE may be supported. Aggregationof multiple cells may be supported with up to 8 serving cells.Alternatively, NR may support a different air interface, other than anOFDM-based. NR networks may include entities such CUs and/or DUs.

In some examples, access to the air interface may be scheduled, whereina scheduling entity (e.g., a base station) allocates resources forcommunication among some or all devices and equipment within its servicearea or cell. Within the present disclosure, as discussed further below,the scheduling entity may be responsible for scheduling, assigning,reconfiguring, and releasing resources for one or more subordinateentities. That is, for scheduled communication, subordinate entitiesutilize resources allocated by the scheduling entity. Base stations arenot the only entities that may function as a scheduling entity. That is,in some examples, a UE may function as a scheduling entity, schedulingresources for one or more subordinate entities (e.g., one or more otherUEs). In this example, the UE is functioning as a scheduling entity, andother UEs utilize resources scheduled by the UE for wirelesscommunication. A UE may function as a scheduling entity in apeer-to-peer (P2P) network, and/or in a mesh network. In a mesh networkexample, UEs may optionally communicate directly with one another inaddition to communicating with the scheduling entity.

Thus, in a wireless communication network with a scheduled access totime-frequency resources and having a cellular configuration, a P2Pconfiguration, and a mesh configuration, a scheduling entity and one ormore subordinate entities may communicate utilizing the scheduledresources.

As noted above, a RAN may include a CU and DUs. A NR BS (e.g., eNB, 5GNode B, Node B, gNB, transmission reception point (TRP), access point(AP)) may correspond to one or multiple BSs. NR cells can be configuredas access cell (ACells) or data only cells (DCells). For example, theRAN (e.g., a central unit or distributed unit) can configure the cells.DCells may be cells used for carrier aggregation or dual connectivity,but not used for initial access, cell selection/reselection, orhandover. In some cases DCells may not transmit synchronizationsignals—in some case cases DCells may transmit SS. NR BSs may transmitdownlink signals to UEs indicating the cell type. Based on the cell typeindication, the UE may communicate with the NR BS. For example, the UEmay determine NR BSs to consider for cell selection, access, handover,and/or measurement based on the indicated cell type.

FIG. 2 illustrates an example logical architecture of a distributedradio access network (RAN) 200, which may be implemented in the wirelesscommunication system illustrated in FIG. 1. A 5G access node 206 mayinclude an access node controller (ANC) 202. The ANC may be a centralunit (CU) of the distributed RAN 200. The backhaul interface to the nextgeneration core network (NG-CN) 204 may terminate at the ANC. Thebackhaul interface to neighboring next generation access nodes (NG-ANs)may terminate at the ANC. The ANC may include one or more TRPs 208(which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs, orsome other term). As described above, a TRP may be used interchangeablywith “cell.”

The TRPs 208 may be a DU. The TRPs may be connected to one ANC (ANC 202)or more than one ANC (not illustrated). For example, for RAN sharing,radio as a service (RaaS), and service specific AND deployments, the TRPmay be connected to more than one ANC. A TRP may include one or moreantenna ports. The TRPs may be configured to individually (e.g., dynamicselection) or jointly (e.g., joint transmission) serve traffic to a UE.

The local architecture 200 may be used to illustrate fronthauldefinition. The architecture may be defined that support fronthaulingsolutions across different deployment types. For example, thearchitecture may be based on transmit network capabilities (e.g.,bandwidth, latency, and/or jitter).

The architecture may share features and/or components with LTE.According to aspects, the next generation AN (NG-AN) 210 may supportdual connectivity with NR. The NG-AN may share a common fronthaul forLTE and NR.

The architecture may enable cooperation between and among TRPs 208. Forexample, cooperation may be preset within a TRP and/or across TRPs viathe ANC 202. According to aspects, no inter-TRP interface may beneeded/present.

According to aspects, a dynamic configuration of split logical functionsmay be present within the architecture 200. As will be described in moredetail with reference to FIG. 5, the Radio Resource Control (RRC) layer,Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC)layer, Medium Access Control (MAC) layer, and a Physical (PHY) layersmay be adaptably placed at the DU or CU (e.g., TRP or ANC,respectively). According to certain aspects, a BS may include a centralunit (CU) (e.g., ANC 202) and/or one or more distributed units (e.g.,one or more TRPs 208).

FIG. 3 illustrates an example physical architecture of a distributed RAN300, according to aspects of the present disclosure. A centralized corenetwork unit (C-CU) 302 may host core network functions. The C-CU may becentrally deployed. C-CU functionality may be offloaded (e.g., toadvanced wireless services (AWS)), in an effort to handle peak capacity.

A centralized RAN unit (C-RU) 304 may host one or more ANC functions.Optionally, the C-RU may host core network functions locally. The C-RUmay have distributed deployment. The C-RU may be closer to the networkedge.

A DU 306 may host one or more TRPs (edge node (EN), an edge unit (EU), aradio head (RH), a smart radio head (SRH), or the like). The DU may belocated at edges of the network with radio frequency (RF) functionality.

FIG. 4 illustrates example components of the BS 110 and UE 120illustrated in FIG. 1, which may be used to implement aspects of thepresent disclosure. As described above, the BS may include a TRP. One ormore components of the BS 110 and UE 120 may be used to practice aspectsof the present disclosure. For example, antennas 452, Tx/Rx 222,processors 466, 458, 464, and/or controller/processor 480 of the UE 120and/or antennas 434, processors 460, 420, 438, and/orcontroller/processor 440 of the BS 110 may be used to perform theoperations described herein and illustrated with reference to FIGS. 11and 13.

FIG. 4 shows a block diagram of a design of a BS 110 and a UE 120, whichmay be one of the BSs and one of the UEs in FIG. 1. For a restrictedassociation scenario, the base station 110 may be the macro BS 110 c inFIG. 1, and the UE 120 may be the UE 120 y. The base station 110 mayalso be a base station of some other type. The base station 110 may beequipped with antennas 434 a through 434 t, and the UE 120 may beequipped with antennas 452 a through 452 r.

At the base station 110, a transmit processor 420 may receive data froma data source 412 and control information from a controller/processor440. The control information may be for the Physical Broadcast Channel(PBCH), Physical Control Format Indicator Channel (PCFICH), PhysicalHybrid ARQ Indicator Channel (PHICH), Physical Downlink Control Channel(PDCCH), etc. The data may be for the Physical Downlink Shared Channel(PDSCH), etc. The processor 420 may process (e.g., encode and symbolmap) the data and control information to obtain data symbols and controlsymbols, respectively. The processor 420 may also generate referencesymbols, e.g., for the PSS, SSS, and cell-specific reference signal. Atransmit (TX) multiple-input multiple-output (MIMO) processor 430 mayperform spatial processing (e.g., precoding) on the data symbols, thecontrol symbols, and/or the reference symbols, if applicable, and mayprovide output symbol streams to the modulators (MODs) 432 a through 432t. For example, the TX MIMO processor 430 may perform certain aspectsdescribed herein for RS multiplexing. Each modulator 432 may process arespective output symbol stream (e.g., for OFDM, etc.) to obtain anoutput sample stream. Each modulator 432 may further process (e.g.,convert to analog, amplify, filter, and upconvert) the output samplestream to obtain a downlink signal. Downlink signals from modulators 432a through 432 t may be transmitted via the antennas 434 a through 434 t,respectively.

At the UE 120, the antennas 452 a through 452 r may receive the downlinksignals from the base station 110 and may provide received signals tothe demodulators (DEMODs) 454 a through 454 r, respectively. Eachdemodulator 454 may condition (e.g., filter, amplify, downconvert, anddigitize) a respective received signal to obtain input samples. Eachdemodulator 454 may further process the input samples (e.g., for OFDM,etc.) to obtain received symbols. A MIMO detector 456 may obtainreceived symbols from all the demodulators 454 a through 454 r, performMIMO detection on the received symbols if applicable, and providedetected symbols. For example, MIMO detector 456 may provide detected RStransmitted using techniques described herein. A receive processor 458may process (e.g., demodulate, deinterleave, and decode) the detectedsymbols, provide decoded data for the UE 120 to a data sink 460, andprovide decoded control information to a controller/processor 480.According to one or more cases, CoMP aspects can include providing theantennas, as well as some Tx/Rx functionalities, such that they residein distributed units. For example, some Tx/Rx processings can be done inthe central unit, while other processing can be done at the distributedunits. For example, in accordance with one or more aspects as shown inthe diagram, the BS mod/demod 432 may be in the distributed units.

On the uplink, at the UE 120, a transmit processor 464 may receive andprocess data (e.g., for the Physical Uplink Shared Channel (PUSCH)) froma data source 462 and control information (e.g., for the Physical UplinkControl Channel (PUCCH) from the controller/processor 480. The transmitprocessor 464 may also generate reference symbols for a referencesignal. The symbols from the transmit processor 464 may be precoded by aTX MIMO processor 466 if applicable, further processed by thedemodulators 454 a through 454 r (e.g., for SC-FDM, etc.), andtransmitted to the base station 110. At the BS 110, the uplink signalsfrom the UE 120 may be received by the antennas 434, processed by themodulators 432, detected by a MIMO detector 436 if applicable, andfurther processed by a receive processor 438 to obtain decoded data andcontrol information sent by the UE 120. The receive processor 438 mayprovide the decoded data to a data sink 439 and the decoded controlinformation to the controller/processor 440.

The controllers/processors 440 and 480 may direct the operation at thebase station 110 and the UE 120, respectively. The processor 440 and/orother processors and modules at the base station 110 may perform ordirect, e.g., the execution of the functional blocks illustrated inFIGS. 11 and 13, and/or other processes for the techniques describedherein. The processor 480 and/or other processors and modules at the UE120 may also perform or direct processes for the techniques describedherein. The memories 442 and 482 may store data and program codes forthe BS 110 and the UE 120, respectively. A scheduler 444 may scheduleUEs for data transmission on the downlink and/or uplink.

FIG. 5 illustrates a diagram 500 showing examples for implementing acommunications protocol stack, according to aspects of the presentdisclosure. The illustrated communications protocol stacks may beimplemented by devices operating in a in a 5G system (e.g., a systemthat supports uplink-based mobility). Diagram 500 illustrates acommunications protocol stack including a Radio Resource Control (RRC)layer 510, a Packet Data Convergence Protocol (PDCP) layer 515, a RadioLink Control (RLC) layer 520, a Medium Access Control (MAC) layer 525,and a Physical (PHY) layer 530. In various examples the layers of aprotocol stack may be implemented as separate modules of software,portions of a processor or ASIC, portions of non-collocated devicesconnected by a communications link, or various combinations thereof.Collocated and non-collocated implementations may be used, for example,in a protocol stack for a network access device (e.g., ANs, CUs, and/orDUs) or a UE.

A first option 505-a shows a split implementation of a protocol stack,in which implementation of the protocol stack is split between acentralized network access device (e.g., an ANC 202 in FIG. 2) anddistributed network access device (e.g., DU 208 in FIG. 2). In the firstoption 505-a, an RRC layer 510 and a PDCP layer 515 may be implementedby the central unit, and an RLC layer 520, a MAC layer 525, and a PHYlayer 530 may be implemented by the DU. In various examples the CU andthe DU may be collocated or non-collocated. The first option 505-a maybe useful in a macro cell, micro cell, or pico cell deployment.

A second option 505-b shows a unified implementation of a protocolstack, in which the protocol stack is implemented in a single networkaccess device (e.g., access node (AN), new radio base station (NR BS), anew radio Node-B (NR NB), a network node (NN), or the like.). In thesecond option, the RRC layer 510, the PDCP layer 515, the RLC layer 520,the MAC layer 525, and the PHY layer 530 may each be implemented by theAN. The second option 505-b may be useful in a femto cell deployment.

Regardless of whether a network access device implements part or all ofa protocol stack, a UE may implement an entire protocol stack (e.g., theRRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525,and the PHY layer 530).

FIG. 6 is a diagram 600 showing an example of a DL-centric subframe. TheDL-centric subframe may include a control portion 602. The controlportion 602 may exist in the initial or beginning portion of theDL-centric subframe. The control portion 602 may include variousscheduling information and/or control information corresponding tovarious portions of the DL-centric subframe. In some configurations, thecontrol portion 602 may be a physical DL control channel (PDCCH), asindicated in FIG. 6. The DL-centric subframe may also include a DL dataportion 604. The DL data portion 604 may sometimes be referred to as thepayload of the DL-centric subframe. The DL data portion 604 may includethe communication resources utilized to communicate DL data from thescheduling entity (e.g., UE or BS) to the subordinate entity (e.g., UE).In some configurations, the DL data portion 604 may be a physical DLshared channel (PDSCH).

The DL-centric subframe may also include a common UL portion 606. Thecommon UL portion 606 may sometimes be referred to as an UL burst, acommon UL burst, and/or various other suitable terms. The common ULportion 606 may include feedback information corresponding to variousother portions of the DL-centric subframe. For example, the common ULportion 606 may include feedback information corresponding to thecontrol portion 602. Non-limiting examples of feedback information mayinclude an ACK signal, a NACK signal, a HARQ indicator, and/or variousother suitable types of information. The common UL portion 606 mayinclude additional or alternative information, such as informationpertaining to random access channel (RACH) procedures, schedulingrequests (SRs), and various other suitable types of information. Asillustrated in FIG. 6, the end of the DL data portion 604 may beseparated in time from the beginning of the common UL portion 606. Thistime separation may sometimes be referred to as a gap, a guard period, aguard interval, and/or various other suitable terms. This separationprovides time for the switch-over from DL communication (e.g., receptionoperation by the subordinate entity (e.g., UE)) to UL communication(e.g., transmission by the subordinate entity (e.g., UE)). One ofordinary skill in the art will understand that the foregoing is merelyone example of a DL-centric subframe and alternative structures havingsimilar features may exist without necessarily deviating from theaspects described herein.

FIG. 7 is a diagram 700 showing an example of an UL-centric subframe.The UL-centric subframe may include a control portion 702. The controlportion 702 may exist in the initial or beginning portion of theUL-centric subframe. The control portion 702 in FIG. 7 may be similar tothe control portion described above with reference to FIG. 6. TheUL-centric subframe may also include an UL data portion 704. The UL dataportion 704 may sometimes be referred to as the payload of theUL-centric subframe. The UL data portion may refer to the communicationresources utilized to communicate UL data from the subordinate entity(e.g., UE) to the scheduling entity (e.g., UE or BS). In someconfigurations, the control portion 702 may be a physical DL controlchannel (PDCCH).

As illustrated in FIG. 7, the end of the control portion 702 may beseparated in time from the beginning of the UL data portion 704. Thistime separation may sometimes be referred to as a gap, guard period,guard interval, and/or various other suitable terms. This separationprovides time for the switch-over from DL communication (e.g., receptionoperation by the scheduling entity) to UL communication (e.g.,transmission by the scheduling entity). The UL-centric subframe may alsoinclude a common UL portion 706. The common UL portion 706 in FIG. 7 maybe similar to the common UL portion 706 described above with referenceto FIG. 7. The common UL portion 706 may additionally or alternativelyinclude information pertaining to channel quality indicator (CQI),sounding reference signals (SRSs), and various other suitable types ofinformation. One of ordinary skill in the art will understand that theforegoing is merely one example of an UL-centric subframe andalternative structures having similar features may exist withoutnecessarily deviating from the aspects described herein.

In some circumstances, two or more subordinate entities (e.g., UEs) maycommunicate with each other using sidelink signals. Real-worldapplications of such sidelink communications may include public safety,proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V)communications, Internet of Everything (IoE) communications, IoTcommunications, mission-critical mesh, and/or various other suitableapplications. Generally, a sidelink signal may refer to a signalcommunicated from one subordinate entity (e.g., UE1) to anothersubordinate entity (e.g., UE2) without relaying that communicationthrough the scheduling entity (e.g., UE or BS), even though thescheduling entity may be utilized for scheduling and/or controlpurposes. In some examples, the sidelink signals may be communicatedusing a licensed spectrum (unlike wireless local area networks, whichtypically use an unlicensed spectrum).

A UE may operate in various radio resource configurations, including aconfiguration associated with transmitting pilots using a dedicated setof resources (e.g., a radio resource control (RRC) dedicated state,etc.) or a configuration associated with transmitting pilots using acommon set of resources (e.g., an RRC common state, etc.). Whenoperating in the RRC dedicated state, the UE may select a dedicated setof resources for transmitting a pilot signal to a network. Whenoperating in the RRC common state, the UE may select a common set ofresources for transmitting a pilot signal to the network. In eithercase, a pilot signal transmitted by the UE may be received by one ormore network access devices, such as an AN, or a DU, or portionsthereof. Each receiving network access device may be configured toreceive and measure pilot signals transmitted on the common set ofresources, and also receive and measure pilot signals transmitted ondedicated sets of resources allocated to the UEs for which the networkaccess device is a member of a monitoring set of network access devicesfor the UE. One or more of the receiving network access devices, or a CUto which receiving network access device(s) transmit the measurements ofthe pilot signals, may use the measurements to identify serving cellsfor the UEs, or to initiate a change of serving cell for one or more ofthe UEs.

In mobile communication systems conforming to certain wirelesscommunications standards, such as the Long Term Evolution (LTE)standards, certain techniques may be used to increase the reliability ofdata transmission. For example, after a base station performs an initialtransmission operation for a specific data channel, a receiver receivingthe transmission attempts to demodulate the data channel during whichthe receiver performs a cyclic redundancy check (CRC) for the datachannel. If, as a result of the check, the initial transmission isdetermined to be successfully demodulated, the receiver (UE) may send anacknowledgement (ACK) to the base station to acknowledge the successfuldemodulation. If, however, the initial transmission is determined to benot successfully demodulated, the receiver may send anegative-acknowledgement (NACK) to the base station. A channel used totransmit ACK/NACK feedback is typically referred to as a response or anACK channel. A physical uplink control channel (PUCCH) or physicaluplink shared channel (PUSCH) may be used as an ACK channel to conveyACK/NACK feedback.

Under other wireless communications standards, such as NR, the ACKchannel information (as well as other information) may be transmittedthrough an uplink structure shown in FIG. 8A. FIG. 8A illustrates anexample uplink structure with a transmission time interval (TTI) thatincludes a region for long uplink burst transmissions. The long uplinkburst may transmit information such as acknowledgment (ACK), channelquality indicator (CQI), or scheduling request (SR) information. Theduration of the region for long uplink burst transmissions, referred toin FIG. 8B as “UL Long Burst,” may vary depending on how many symbolsare used for the physical downlink control channel (PDCCH), the gap, andthe short uplink burst (shown as UL Short Burst), as shown in FIG. 8B.

FIG. 9 illustrates how a base sequence, agreed upon between a gNB/eNBand UE may be used to transmit UCI. As illustrated, differentcyclic-shifts may be chosen to send 1 or 2 bits of UCI. For example, fora 1-bit transmission, a cyclic shift of 0 may indicate a first value(e.g., an ACK), while a cyclic shift of 1 indicates a second value(e.g., a NACK). Similarly, for a 2-bit transmission, 4 different cyclicshifts may be used to convey the four different possible bitcombinations. In the illustrated example, cyclic shifts of 0, 3, 6, and9 may each indicate 1 of the 4 possible 2-bit values. 2-bit values maybe used, for example, to provide more than 1 ACK bit or a combination ofACK feedback and other information, such as a scheduling request (SR) orchannel quality indicator (CQI).

FIG. 10 illustrates an example sequence-based transmission, inaccordance with certain aspects of the present disclosure. Using a basesequence of a certain length, different sequences may be derived byapplying different cyclic shifts. As illustrated, the cyclic shifts mayrange from 0 (no cyclic shift, corresponding to the base sequence) to amaximum cyclic shift based on the sequence length.

Example (PUCCH) Sequence Configuration

Accordingly, certain embodiments herein provide techniques for signalingPUCCH sequence configurations (e.g., base sequence and cyclic shifts).As will be described in greater detail below, the sequenceconfigurations may indicate a base sequence and assign possible cyclicshifts a UE may apply when generating a PUCCH sequence to efficientlyindicate one or more bits of uplink control information (UCI).

FIG. 11 illustrates example operations 1100 for generating andtransmitting UCI by a user equipment (UE), in accordance with certainaspects of the present disclosure.

Operations 1100 begin, at 1102, by receiving signaling indicating a basesequence from a set of base sequences available for use in sending oneor more bits of uplink control information (UCI) within a transmissiontime interval (TTI). For example, the signaling may be received from anetwork entity (such as a base station/gNB/eNB). The TTI may correspond,for example, to an UL or DL centric slot, such as shown in FIGS. 8A and8B.

At 1104, the UE receives signaling indicating a set of feasible cyclicshifts. At 1106, the UE selects one of the cyclic shifts based on avalue of the one or more bits of UCI. At 1108, the UE transmit the UCIusing the base sequence and the selected cyclic shift.

FIG. 12 illustrates example operations 1200 for wireless communicationsby a network entity (e.g., a gNB/eNB), in accordance with certainaspects of the present disclosure. Operations 1200 may be consideredcomplementary (network-side) operations to operations 1100. For example,operations 1200 may be performed by a gNB serving a UE performingoperations 1100.

Operations 1200 begin, at 1202, by providing, to at least one userequipment (UE), signaling indicating a base sequence from a set of basesequences available for use in sending one or more bits of uplinkcontrol information (UCI) within a transmission time interval (TTI). At1204, the network entity provides signaling indicating a set of feasiblecyclic shifts to at least one UE. At 1206, the network entity detectsUCI transmitted from the UE using the base sequence and one of thecyclic shifts. For example, an eNB detecting UCI transmitted from the UEmay do so as determined by a combination of the base sequence andparticular cyclic shift used.

The techniques presented herein provide configuration and signalingallowing selection of a base sequence and cyclic shift for each UE. Insome cases, a set of base sequences (for each resource block (RB)allocation size) may be pre-defined, e.g., in 3GPP standard. In somecases, the size of set of cyclic shifts assigned to a UE depends on thesize of UCI that UE has to feed back (e.g., 2 cyclic shifts may beassigned for 1-bit of UCI or 4 cyclic shifts for 2-bits of UCI).

Various types of signaling may be used to signal a UE with one or morebase sequences and RB allocation sizes. The signaling may includesemi-static signaling, dynamic signaling, or a combination of the two.In some cases an eNB may send RRC signaling semi-statically configuringthe UE to use one of the set of base sequences.

According to one option, an eNB may semi-statically configure a UE touse one base sequence (for each RB allocation size) out of the set ofbase sequences via RRC signaling. The eNB may use downlink controlinformation (DCI) to dynamically signal to the UE the RB allocation size(which will implicitly configure the base sequence to use).

According to another option, an eNB may semi-statically configure a UEto use one base sequence and RB allocation size, selected from the setof base sequences and RB allocation sizes, via RRC signaling. Accordingto another option, an eNB may dynamically configure a UE to use one basesequence and RB allocation size, out of the set of base sequences and RBallocation sizes, via DCI.

According to another option, an eNB may semi-statically configure a UEto UE RB allocation size via RRC signaling. The eNB may then use DCI todynamically signal one base sequence out of the set of base sequences.

As an example of one option, the eNB may use DCI to dynamically signalUE which 2 or 4 cyclic shifts, out of a larger set of possible cyclicshifts (e.g., 12 for one RB PUCCH allocation), to signal 1 or 2 bitsUCI, respectively.

In some cases, the particular set of cyclic shifts used to signal UCImay be selected based on various considerations. In some cases, an eNBmay design the distance between shifts associated with each UE isinversely proportional or decreases relative to the number of UEsmultiplexed together.

For example, in some cases, a larger distance may be used between shiftsif the number of UEs multiplexed on the same PUCCH RB(s) is smaller(than a threshold value). The larger distance may make it easier todistinguish the different UCI values. On the other hand, an eNB may usea smaller distance between shifts if the number of UEs multiplexed onthe same PUCCH RB(s) is larger (than a threshold value).

How an eNB may assign cyclic shifts to accomplish different goals may bebest understood considering some illustrative examples. For example, ifthere is only one UE, an eNB may maximize the distance between thecyclic-shift that corresponds to each UCI information according to oneor more of the following example rules:

-   -   1) If there is only one UE with 2 bit UCI, use cyclic shift of        (0,3,6,9) to send two bits with 1 RB allocation. If there is        only one UE with 2 bit UCI, use cyclic shift of (1,4,7,10) to        send two bits with 1 RB allocation.    -   2) If there is only one UE with 1 bit UCI, use cyclic shift of        (0, 6) to send one bits with 1 RB allocation    -   3) If there is only one UE with 1 bit UCI, use cyclic shift of        (1, 7) to send one bits with 1 RB allocation    -   4) If there is only one UE with 2 bit UCI, use cyclic shift of        (0,6,12,18) to send two bits with 2 RB allocation    -   5) If there is only one UE with 1 bit UCI, use cyclic shift of        (0, 12) to send one bits with 2 RB allocation

On the other hand, if smaller distance are used between shifts, an eNBmay determine and assign cyclic shifts to different UEs according to oneor more of the following example rules:

-   -   1) If there are 3 UEs, each with 2 bits: UE1=(0,1,2,3),        UE2=(4,5,6,7), UE3=(8,9,10,11);    -   2) If there is 1 UE with 1 bit and 2 UEs with 2 bits: UE1=(1,2),        UE2=(4,5,6,7), UE3=(8,9,10,11) (which gives maximum separation        between Ues, 0 is not used to separate UE1 and UE3, 3 is not        used to separate UE1 and UE2);    -   3) If there are 3 UEs with 1 bit: UE1=(0,1), UE2=(4,5),        UE3=(8,9) (which gives maximum separation between UEs).

In some cases, an eNB may try to maximize the distance between shiftseven if the number of UEs multiplexed on the same PUCCH RB(s) getslarger. In such cases, an eNB may assign cyclic shifts according to thefollowing example rules:

-   -   1) For 3 UEs with 2 bits of UCI: UE1=(0,3,6,9), UE2=(1,4,7,10),        UE3=(2,5,8,11);    -   2) For 1 UE with 1 bit of UCI and 2 UEs with 2 bits of UCI:        UE1=(0,6), UE2=(1,4,7,10), UE3=(2,5,8,11) (which gives maximum        separation between data for each UE);    -   3) For 3 UEs with 1 bit of UCI: UE1=(0,6), UE2=(2,8), UE3=(4,10)        (which gives maximum separation between data for each UE).

In some cases, there may be a balance the options described above. Forexample, the following rule may provide such a balance:

-   -   1) For 3 UEs with 1 bit of UCI: UE1=(0,2), UE2=(4,6), UE3=(8,10)        (equal distance between all hypotheses).

As noted above, an eNB may use DCI to dynamically signal UE whichparticular cyclic shifts to use out of a larger set of possible cyclicshifts. For example, assuming a set of 12 possible cyclic shifts for oneRB PUCCH allocation, the eNB may signal, via DCI, which 2 or 4 cyclicshifts for a UE to use for 1 or 2 bits UCI respectively. As analternative, an eNB may semi-statically configure the UE which 2 or 4cyclic shifts to use for 1 or 2 bits UCI respectively via RRC signaling.

In some cases, when there are two PUCCH symbols, cyclic shifts may beassigned according to the following example rules:

-   -   1) For 3 UEs with 2 bits of UCI for the first PUCCH symbol:        UE1=(0,3,6,9), UE2=(1,4,7,10), UE3=(2,5,8,11);    -   3 For 3 UEs with 2 bits of UCI for the second PUCCH symbol:        UE1=(0,1,2,3), UE2=(4,5,6,7), UE3=(8,9,10,11).

Those skilled in the art will appreciate that the particular valuesnoted above are examples only. Any other suitable values that achieve adesired affect (longer or shorter distances) may be assigned by an eNB.

The methods disclosed herein comprise one or more steps or actions forachieving the described method. The method steps and/or actions may beinterchanged with one another without departing from the scope of theclaims. In other words, unless a specific order of steps or actions isspecified, the order and/or use of specific steps and/or actions may bemodified without departing from the scope of the claims.

As used herein, a phrase referring to “at least one of” a list of itemsrefers to any combination of those items, including single members. Asan example, “at least one of: a, b, or c” is intended to cover a, b, c,a-b, a-c, b-c, and a-b-c, as well as any combination with multiples ofthe same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b,b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

As used herein, the term “determining” encompasses a wide variety ofactions. For example, “determining” may include calculating, computing,processing, deriving, investigating, looking up (e.g., looking up in atable, a database or another data structure), ascertaining and the like.Also, “determining” may include receiving (e.g., receiving information),accessing (e.g., accessing data in a memory) and the like. Also,“determining” may include resolving, selecting, choosing, establishingand the like.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” Unless specifically statedotherwise, the term “some” refers to one or more. All structural andfunctional equivalents to the elements of the various aspects describedthroughout this disclosure that are known or later come to be known tothose of ordinary skill in the art are expressly incorporated herein byreference and are intended to be encompassed by the claims. Moreover,nothing disclosed herein is intended to be dedicated to the publicregardless of whether such disclosure is explicitly recited in theclaims. No claim element is to be construed under the provisions of 35U.S.C. § 112, sixth paragraph, unless the element is expressly recitedusing the phrase “means for” or, in the case of a method claim, theelement is recited using the phrase “step for.”

The various operations of methods described above may be performed byany suitable means capable of performing the corresponding functions.The means may include various hardware and/or software component(s)and/or module(s), including, but not limited to a circuit, anapplication specific integrated circuit (ASIC), or processor. Generally,where there are operations illustrated in figures, those operations mayhave corresponding counterpart means-plus-function components withsimilar numbering.

For example, means for transmitting and/or means for receiving maycomprise one or more of a transmit processor 420, a TX MIMO processor430, a receive processor 438, or antenna(s) 434 of the base station 110and/or the transmit processor 464, a TX MIMO processor 466, a receiveprocessor 458, or antenna(s) 452 of the user equipment 120.Additionally, means for generating, means for multiplexing, and/or meansfor applying may comprise one or more processors, such as thecontroller/processor 440 of the base station 110 and/or thecontroller/processor 480 of the user equipment 120.

The various illustrative logical blocks, modules and circuits describedin connection with the present disclosure may be implemented orperformed with a general purpose processor, a digital signal processor(DSP), an application specific integrated circuit (ASIC), a fieldprogrammable gate array (FPGA) or other programmable logic device (PLD),discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general-purpose processor may be a microprocessor, but in thealternative, the processor may be any commercially available processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices, e.g., a combinationof a DSP and a microprocessor, a plurality of microprocessors, one ormore microprocessors in conjunction with a DSP core, or any other suchconfiguration.

If implemented in hardware, an example hardware configuration maycomprise a processing system in a wireless node. The processing systemmay be implemented with a bus architecture. The bus may include anynumber of interconnecting buses and bridges depending on the specificapplication of the processing system and the overall design constraints.The bus may link together various circuits including a processor,machine-readable media, and a bus interface. The bus interface may beused to connect a network adapter, among other things, to the processingsystem via the bus. The network adapter may be used to implement thesignal processing functions of the PHY layer. In the case of a userterminal 120 (see FIG. 1), a user interface (e.g., keypad, display,mouse, joystick, etc.) may also be connected to the bus. The bus mayalso link various other circuits such as timing sources, peripherals,voltage regulators, power management circuits, and the like, which arewell known in the art, and therefore, will not be described any further.The processor may be implemented with one or more general-purpose and/orspecial-purpose processors. Examples include microprocessors,microcontrollers, DSP processors, and other circuitry that can executesoftware. Those skilled in the art will recognize how best to implementthe described functionality for the processing system depending on theparticular application and the overall design constraints imposed on theoverall system.

If implemented in software, the functions may be stored or transmittedover as one or more instructions or code on a computer readable medium.Software shall be construed broadly to mean instructions, data, or anycombination thereof, whether referred to as software, firmware,middleware, microcode, hardware description language, or otherwise.Computer-readable media include both computer storage media andcommunication media including any medium that facilitates transfer of acomputer program from one place to another. The processor may beresponsible for managing the bus and general processing, including theexecution of software modules stored on the machine-readable storagemedia. A computer-readable storage medium may be coupled to a processorsuch that the processor can read information from, and write informationto, the storage medium. In the alternative, the storage medium may beintegral to the processor. By way of example, the machine-readable mediamay include a transmission line, a carrier wave modulated by data,and/or a computer readable storage medium with instructions storedthereon separate from the wireless node, all of which may be accessed bythe processor through the bus interface. Alternatively, or in addition,the machine-readable media, or any portion thereof, may be integratedinto the processor, such as the case may be with cache and/or generalregister files. Examples of machine-readable storage media may include,by way of example, RAM (Random Access Memory), flash memory, ROM (ReadOnly Memory), PROM (Programmable Read-Only Memory), EPROM (ErasableProgrammable Read-Only Memory), EEPROM (Electrically ErasableProgrammable Read-Only Memory), registers, magnetic disks, opticaldisks, hard drives, or any other suitable storage medium, or anycombination thereof. The machine-readable media may be embodied in acomputer-program product.

A software module may comprise a single instruction, or manyinstructions, and may be distributed over several different codesegments, among different programs, and across multiple storage media.The computer-readable media may comprise a number of software modules.The software modules include instructions that, when executed by anapparatus such as a processor, cause the processing system to performvarious functions. The software modules may include a transmissionmodule and a receiving module. Each software module may reside in asingle storage device or be distributed across multiple storage devices.By way of example, a software module may be loaded into RAM from a harddrive when a triggering event occurs. During execution of the softwaremodule, the processor may load some of the instructions into cache toincrease access speed. One or more cache lines may then be loaded into ageneral register file for execution by the processor. When referring tothe functionality of a software module below, it will be understood thatsuch functionality is implemented by the processor when executinginstructions from that software module.

Also, any connection is properly termed a computer-readable medium. Forexample, if the software is transmitted from a website, server, or otherremote source using a coaxial cable, fiber optic cable, twisted pair,digital subscriber line (DSL), or wireless technologies such as infrared(IR), radio, and microwave, then the coaxial cable, fiber optic cable,twisted pair, DSL, or wireless technologies such as infrared, radio, andmicrowave are included in the definition of medium. Disk and disc, asused herein, include compact disc (CD), laser disc, optical disc,digital versatile disc (DVD), floppy disk, and Blu-ray® disc where disksusually reproduce data magnetically, while discs reproduce dataoptically with lasers. Thus, in some aspects computer-readable media maycomprise non-transitory computer-readable media (e.g., tangible media).Combinations of the above should also be included within the scope ofcomputer-readable media. The phrase computer-readable medium does notrefer to a transitory propagating signal.

Thus, certain aspects may comprise a computer program product forperforming the operations presented herein. For example, such a computerprogram product may comprise a computer-readable medium havinginstructions stored (and/or encoded) thereon, the instructions beingexecutable by one or more processors to perform the operations describedherein.

Further, it should be appreciated that modules and/or other appropriatemeans for performing the methods and techniques described herein can bedownloaded and/or otherwise obtained by a user terminal and/or basestation as applicable. For example, such a device can be coupled to aserver to facilitate the transfer of means for performing the methodsdescribed herein. Alternatively, various methods described herein can beprovided via storage means (e.g., RAM, ROM, a physical storage mediumsuch as a compact disc (CD) or floppy disk, etc.), such that a userterminal and/or base station can obtain the various methods uponcoupling or providing the storage means to the device. Moreover, anyother suitable technique for providing the methods and techniquesdescribed herein to a device can be utilized.

It is to be understood that the claims are not limited to the preciseconfiguration and components illustrated above. Various modifications,changes and variations may be made in the arrangement, operation anddetails of the methods and apparatus described above without departingfrom the scope of the claims.

What is claimed is:
 1. A method for wireless communications by a userequipment (UE), comprising: receiving signaling indicating a basesequence from a set of base sequences available for use in sending oneor more bits of uplink control information (UCI) within a transmissiontime interval (TTI); receiving signaling indicating a set of cyclicshifts from a network entity; selecting one of the cyclic shifts fromthe set of cyclic shifts based on a value of the one or more bits ofUCI; and transmitting the one or more bits of UCI using the basesequence and the selected cyclic shift, wherein a size of the set ofcyclic shifts depends on a number of the one or more bits of UCI.
 2. Themethod of claim 1, wherein the signaling indicating the set of cyclicshifts comprises dynamic signaling.
 3. The method of claim 1, whereinthe signaling indicating the set of cyclic shifts comprises radioresource control (RRC) signaling.
 4. The method of claim 1, wherein thesignaling indicating the base sequence comprises radio resource control(RRC) signaling semi-statically configuring the UE to use one of the setof base sequences.
 5. The method of claim 4, wherein: the RRC signalingindicates a base sequence for each resource block (RB) allocation size;and the UE receives dynamic signaling indicating an RB allocation size.6. The method of claim 4, wherein: the RRC signaling indicates a basesequence for each resource block (RB) allocation size; and the RRCsignaling also indicates an RB allocation size.
 7. The method of claim1, wherein the signaling indicating the base sequence comprises: radioresource control (RRC) signaling semi-statically configuring a UE RBallocation size; and dynamic signaling indicating the base sequence outof the set of base sequences.
 8. The method of claim 1, wherein: whenthe one or more bits of UCI is provided via multiple physical uplinkcontrol channel (PUCCH) orthogonal frequency division multiplexing(OFDM) symbols, the UE is configured with a different set of cyclicshifts for each symbol.
 9. A method for wireless communications by anetwork entity, comprising: providing, to at least one user equipment(UE), signaling indicating a base sequence from a set of base sequencesavailable for use in sending one or more bits of uplink controlinformation (UCI) within a transmission time interval (TTI); providingsignaling indicating a set of cyclic shifts to at least one UE; anddetecting one or more bits of UCI transmitted from the UE using the basesequence and one of the cyclic shifts selected from the set of cyclicshifts, wherein a size of the set of cyclic shifts depends on a numberof the one or more bits of UCI.
 10. The method of claim 9, wherein thesignaling indicating the set of cyclic shifts comprises dynamicsignaling.
 11. The method of claim 9, wherein the signaling indicatingthe set of cyclic shifts comprises radio resource control (RRC)signaling.
 12. The method of claim 9, wherein the signaling indicatingthe base sequence comprises radio resource control (RRC) signalingsemi-statically configuring the UE to use one of the set of basesequences.
 13. The method of claim 12, wherein: the RRC signalingindicates a base sequence for each resource block (RB) allocation size;and the UE receives dynamic signaling indicating an RB allocation size.14. The method of claim 13, wherein: the RRC signaling indicates a basesequence for each resource block (RB) allocation size; and the RRCsignaling also indicates an RB allocation size.
 15. The method of claim9, wherein the signaling indicating the base sequence comprises: radioresource control (RRC) signaling semi-statically configuring a UE RBallocation size; and dynamic signaling indicating the base sequence outof the set of base sequences.
 16. The method of claim 9, wherein: whenthe one or more bits of UCI is provided via multiple physical uplinkcontrol channel (PUCCH) orthogonal frequency division multiplexing(OFDM) symbols, the UE is configured with a different set of cyclicshifts for each symbol.
 17. An apparatus for wireless communications bya user equipment (UE), comprising: means for receiving signalingindicating a base sequence from a set of base sequences available foruse in sending one or more bits of uplink control information (UCI)within a transmission time interval (TTI); means for receiving signalingindicating a set of cyclic shifts from a network entity; means forselecting one of the cyclic shifts from the set of cyclic shifts basedon a value of the one or more bits of UCI; and means for transmittingthe one or more bits of UCI using the base sequence and the selectedcyclic shift, wherein a size of the set of cyclic shifts depends on anumber of the one or more bits of UCI.
 18. The apparatus of claim 17,wherein the signaling indicating the set of cyclic shifts comprisesdynamic signaling.
 19. The apparatus of claim 17, wherein the signalingindicating the set of cyclic shifts comprises radio resource control(RRC) signaling.
 20. The apparatus of claim 17, wherein the signalingindicating the base sequence comprises radio resource control (RRC)signaling semi-statically configuring the UE to use one of the set ofbase sequences.
 21. The apparatus of claim 20, wherein: the RRCsignaling indicates a base sequence for each resource block (RB)allocation size; and the UE receives dynamic signaling indicating an RBallocation size.
 22. The apparatus of claim 20, wherein: the RRCsignaling indicates a base sequence for each resource block (RB)allocation size; and the RRC signaling also indicates an RB allocationsize.
 23. The apparatus of claim 17, wherein the signaling indicatingthe base sequence comprises: radio resource control (RRC) signalingsemi-statically configuring a UE RB allocation size; and dynamicsignaling indicating the base sequence out of the set of base sequences.24. The apparatus of claim 17, wherein: when the one or more bits of UCIis provided via multiple physical uplink control channel (PUCCH)orthogonal frequency division multiplexing (OFDM) symbols, the UE isconfigured with a different set of cyclic shifts for each symbol.
 25. Anapparatus for wireless communications by a network entity, comprising:means for providing, to at least one user equipment (UE), signalingindicating a base sequence from a set of base sequences available foruse in sending one or more bits of uplink control information (UCI)within a transmission time interval (TTI); means for providing signalingindicating a set of cyclic shifts to at least one UE; and means fordetecting one or more bits of UCI transmitted from the UE using the basesequence and one of the cyclic shifts selected from the set of cyclicshifts, wherein a size of the set of cyclic shifts depends on a numberof the one or more bits of UCI.
 26. The apparatus of claim 25, whereinthe signaling indicating the set of cyclic shifts comprises dynamicsignaling.
 27. The apparatus of claim 25, wherein the signalingindicating the set of cyclic shifts comprises radio resource control(RRC) signaling.
 28. The apparatus of claim 25, wherein the signalingindicating the base sequence comprises radio resource control (RRC)signaling semi-statically configuring the UE to use one of the set ofbase sequences.
 29. The apparatus of claim 28, wherein: the RRCsignaling indicates a base sequence for each resource block (RB)allocation size; and the UE receives dynamic signaling indicating an RBallocation size.
 30. The apparatus of claim 29, wherein: the RRCsignaling indicates a base sequence for each resource block (RB)allocation size; and the RRC signaling also indicates an RB allocationsize.
 31. The apparatus of claim 25, wherein the signaling indicatingthe base sequence comprises: radio resource control (RRC) signalingsemi-statically configuring a UE RB allocation size; and dynamicsignaling indicating the base sequence out of the set of base sequences.32. The apparatus of claim 25, wherein: when the one or more bits of UCIis provided via multiple physical uplink control channel (PUCCH)orthogonal frequency division multiplexing (OFDM) symbols, the UE isconfigured with a different set of cyclic shifts for each symbol.
 33. Anapparatus for wireless communications by a user equipment (UE),comprising: a receiver configured to receive signaling indicating a basesequence from a set of base sequences available for use in sending oneor more bits of uplink control information (UCI) within a transmissiontime interval (TTI) and signaling indicating a set of cyclic shifts; aprocessor configured to select one of the cyclic shifts from the set ofcyclic shifts based on a value of the one or more bits of UCI; and atransmitter configured to transmit the one or more bits of UCI using thebase sequence and the selected cyclic shift, wherein a size of the setof cyclic shifts depends on a number of the one or more bits of UCI. 34.An apparatus for wireless communications by a network entity,comprising: a transmitter configured to transmit, to at least one userequipment (UE), signaling indicating a base sequence from a set of basesequences available for use in sending one or more bits of uplinkcontrol information (UCI) within a transmission time interval (TTI) andto transmit signaling indicating a set of cyclic shifts to at least oneUE; and a receiver configured to detect one or more bits of UCItransmitted from the UE using the base sequence and one of the cyclicshifts selected from the set of cyclic shifts, wherein a size of the setof cyclic shifts depends on a number of the one or more bits of UCI.